\f__.._... .uu I'uvvul VII - Gas sales across type of gasoline: 80% of gas sales tend to be regular, 15% tend to be midgrade and 5% tend to be premium. 0 Effect of price on demand: Every $0.10 increase in the price per gallon of gas tends to decrease gallons of gas sold by 1% to 3%. 0 Monthly Seasonal Factors: Chart representing the monthly seasonality factor for gasoline (a factor of 1 .00 represents the baseline monthly demand). Table : Seasonal factors for monthly demand